Nope, it should work right out of the box, although the underbarrels are currently mis-aligned.

Any idea why it isn't working then?

I can attach underbarrel weapons to the right guns just fine. My problem is that there are two models for the attachments, stacked on top of each other. Your assets are the ones attached to the gun, but I also have Iridar's underbarrel mod and those vanilla-style assets are attached to the bottom of your assets. Not sure why both models are being applied. When I first downloaded these mods together, they separated just fine.

Give me a the exact name/model of one of the weapons you can attach a launcher or shotty to. I want to go try it and see if maybe I was just selecting the wrong weapon (for some reason I have duplicate guns - one with the colored icon, one with a white silhouette icon). I tried a few but maybe, somehow, they were just all the wrong ones. Not sure where I am getting the extra guns from though.

Originally posted by CDrake:

I can attach underbarrel weapons to the right guns just fine. My problem is that there are two models for the attachments, stacked on top of each other. Your assets are the ones attached to the gun, but I also have Iridar's underbarrel mod and those vanilla-style assets are attached to the bottom of your assets. Not sure why both models are being applied. When I first downloaded these mods together, they separated just fine.

Let me try to fix this issue real quick.

Originally posted by HAL9000:

Give me a the exact name/model of one of the weapons you can attach a launcher or shotty to. I want to go try it and see if maybe I was just selecting the wrong weapon (for some reason I have duplicate guns - one with the colored icon, one with a white silhouette icon). I tried a few but maybe, somehow, they were just all the wrong ones. Not sure where I am getting the extra guns from though.

https://steamhost.cn/steamcommunity_com/workshop/filedetails/discussion/1132835147/1780513643851524950/

Ya... just did some testing before I saw this. I was using the duplicate versions that are (I guess) from another mod. Have no idea what mod adds those same weapons though and doesn't have the underbarrel support.

Originally posted by CDrake:

I can attach underbarrel weapons to the right guns just fine. My problem is that there are two models for the attachments, stacked on top of each other. Your assets are the ones attached to the gun, but I also have Iridar's underbarrel mod and those vanilla-style assets are attached to the bottom of your assets. Not sure why both models are being applied. When I first downloaded these mods together, they separated just fine.

It should be fixed now.